branched burreed USDA PLANTS Symbol: SPER
U.S. Nativity: Exotic
Habit: Aquatic Plants Forbs/Herbs
Sparganium erectum L.
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Taxonomic Rank: Liliopsida: Typhales: Sparganiaceae
Synonym(s): exotic bur-reed, branched burreed,simple-stem burr-reed, simplestem bur-reed
Appearance
Sparganium erectum is a perennial wetland or aquatic herbaceous plant that is native to North America. It grows from slender rhizomes with slender terete stems. S. erectum grows from 3-8 ft. (0.9-2.4 m) tall. It is found around the world and is listed as native to North America, Africa, temperate Asia and Europe.
Foliage
The long flat leaves are alternate. They are often slightly keeled. The leaves may be either floating or held above the water.
Flowers
The inflorescence is branched. Each inflorescence has from 5-13 staminate heads and 2-4 pistillate heads. Pistillate heads are sessile.
Fruit
Fruits are obovoid sessile nutlets. Fruits have a truncated top with a small style at the tip.
Ecological Threat
Sparganium erectumis a federally listed noxious weed. It can be found in California and other states, as well as Canada. S. erectum is listed as introduced to Australia.
Identification, Biology, Control and Management Resources
Selected Images from Invasive.orgView All Images at Invasive.org


Fruit(s); Fruit. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage
Fruit(s); Fruits with spongy layer mostly removed, exposing stony, ridged endocarp. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage
Fruit(s); Fruits. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage
EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org 		 


State List
This map identifies those states that list this species on their invasive species list or law.

Invasive Listing Sources: